MCP server.
La Grande Carte’s French public open data, right inside your assistant: communes, cadastral parcels, natural risks, urban planning, property sales, tap-water and air quality, crime… Read-only, official sources.
Server URL.
https://lagrandecarte.fr/mcp
Connect from your assistant.
- In Claude: Settings › Connectors › Add custom connector. Elsewhere (ChatGPT, Cursor, Le Chat…): look for “custom connector” or “MCP server”.
- Paste the URL above and start the connection.
- Your assistant opens La Grande Carte: sign in or create an account (free, email or Google).
- Click “Allow”. An API key “MCP · …” is created on your account; revoking it from your account disconnects the assistant.
With an API key.
For clients that accept a header (Claude Code, Cursor, VS Code…), create a key from your account. Claude Code:
claude mcp add --transport http lagrandecarte https://lagrandecarte.fr/mcp \ --header "X-API-Key: YOUR_KEY"
JSON configuration:
{
"mcpServers": {
"lagrandecarte": {
"type": "http",
"url": "https://lagrandecarte.fr/mcp",
"headers": {
"X-API-Key": "YOUR_KEY"
}
}
}
}Example prompts.
- “What do you know about the commune of Bosdarros? How good is the tap water?”
- “I’m visiting a house at 4 rue Porte Jaune in Bourges: natural risks, zoning, recent sales nearby?”
- “Compare median income, rents and crime between Pau and Tarbes.”
- “Poverty rate and life expectancy in Pyrénées-Atlantiques compared with Nouvelle-Aquitaine?”
Tools.
| Tool | Description |
|---|---|
| get_commune | Everything on a commune: population, income, rents, tap-water and air quality, crime, climate, mayor, finances… (statistics included) |
| search_address | Find a commune, an address or a locality; returns the INSEE code and coordinates |
| get_parcel_enrichments | Full report on a parcel: risks, zoning, sales, energy ratings, noise, networks… |
| get_parcel_at_point | The cadastral parcel at a point |
| get_parcel | A parcel by its cadastral reference (IDU) |
| get_departement | A département with its statistics, optionally its communes |
| get_region | A région with its statistics, optionally its départements |
| find_commune | The commune containing a point |
| list_communes | The communes of a département |
| list_departements | The départements, optionally of one région |
| list_regions | The régions |
Limits and data.
Every tool call counts as one request against your account’s quota. The free plan includes 100 requests a day for non-commercial use; paid plans cover commercial use. Data under the Etalab Open Licence 2.0: credit “La Grande Carte”.
Your assistant only sends us tool parameters (a commune, an address), never your conversation. Privacy policy.
Questions or problems: contact@lagrandecarte.fr